Yamaha F2.5SMHB v8 Owner's Manual

Yamaha F2.5SMHB manual cover
Pages 84
Year 2015
Language(s)
English en

Yamaha F2.5SMHB Specification

The Yamaha F2.5SMHB is a compact and efficient outboard motor designed for small boats and dinghies. It features a 4-stroke, single-cylinder engine with a displacement of 72cc, delivering reliable and efficient performance for a variety of watercraft applications. The motor is equipped with a manual pull start system, ensuring simplicity and ease of use. It offers a maximum power output of 2.5 horsepower, making it suitable for lightweight vessels requiring moderate thrust.

The F2.5SMHB employs an air-cooled cooling system, eliminating the need for a water pump and reducing maintenance concerns in shallow or debris-laden waters. It includes a 0.9-liter internal fuel tank with a visual fuel gauge, allowing for straightforward monitoring of fuel levels during operation. The motor’s compact dimensions and lightweight construction, weighing approximately 17 kg, facilitate easy transportation and installation. A 360-degree steering capability enhances maneuverability, permitting precise control in tight spaces.

Its ergonomic design features a large carrying handle for convenient handling, and the throttle grip is equipped with a friction adjuster, allowing users to set a preferred throttle position for extended runs. Yamaha's engineering ensures low emissions and noise levels, aligning with environmental standards and providing a more pleasant user experience. The F2.5SMHB is coated with a protective paint process that includes a zinc coating to guard against corrosion, enhancing durability in marine environments. Overall, the Yamaha F2.5SMHB offers a blend of portability, efficiency, and user-friendly operation for small boat enthusiasts.

Yamaha F2.5SMHB F.A.Q.

How do I perform regular maintenance on my Yamaha F2.5SMHB outboard motor?

To perform regular maintenance on your Yamaha F2.5SMHB, follow these steps: change the engine oil every 50 hours of use or once a season, inspect the spark plug, check the fuel system for leaks, ensure the propeller is free of damage, and flush the cooling system with fresh water after each use in saltwater.

What type of oil should be used for the Yamaha F2.5SMHB?

Use a high-quality 4-stroke marine engine oil that meets or exceeds the NMMA FC-W certification standard for the Yamaha F2.5SMHB. Refer to the owner's manual for specific oil grade recommendations.

How do I troubleshoot starting issues with my Yamaha F2.5SMHB?

If your Yamaha F2.5SMHB won't start, check the fuel level and quality, inspect the spark plug for wear or fouling, ensure the kill switch is engaged, and verify that the choke is properly set. If issues persist, consult a professional technician.

What is the proper way to store the Yamaha F2.5SMHB for the winter?

To store the Yamaha F2.5SMHB for the winter, follow these steps: drain the fuel tank and carburetor, change the engine oil, fog the cylinders with fogging oil, disconnect the battery (if applicable), and store the motor upright in a dry, cool place.

How do I replace the water pump impeller on a Yamaha F2.5SMHB?

To replace the water pump impeller, remove the lower unit, take off the water pump housing, and replace the old impeller with a new one. Ensure the vanes are oriented correctly during installation, and reassemble the components.

What should I do if my Yamaha F2.5SMHB overheats?

If the Yamaha F2.5SMHB overheats, stop the engine immediately and check for blockages in the cooling water intake. Inspect the impeller for damage and ensure there is adequate water flow. If the problem persists, consult a professional technician.

Can I use ethanol-blended fuel in my Yamaha F2.5SMHB?

Yamaha recommends using fuel with no more than 10% ethanol (E10) for the F2.5SMHB. Higher ethanol content can cause fuel system damage and operational issues. Always use fresh, clean fuel.

How often should I check the spark plug on my Yamaha F2.5SMHB?

Check the spark plug every 100 hours of operation or at least once a season. Look for signs of wear, fouling, or damage, and replace if necessary. Use the spark plug type recommended by Yamaha.

What are the steps to flush the Yamaha F2.5SMHB cooling system?

To flush the cooling system, attach a garden hose to the flushing port, start the engine, and let it idle for about 10 minutes to circulate fresh water. Ensure all salt and debris are removed to prevent corrosion and blockages.

How do I adjust the idle speed on a Yamaha F2.5SMHB?

To adjust the idle speed, locate the idle speed screw on the carburetor and turn it clockwise to increase or counter-clockwise to decrease the idle RPM. Make adjustments while the engine is running and in neutral.